Die head



R. E. HYDE March 8, 1932.

DIE HEAD Filed July 12, 1929 2 Sheets-Sheet l INVENTOR. Edi Z921 6. Jfyae I March 8, 1932. R. E.- HYDE DIE HEAD Filed July 12, 1929 2 Sheets-Sheet 2 I6 I i I t I I5 22. 2! v Z0 IN VEN TOR.

Kai 6h 6. 7796!? A TTORNEYS.

Patented Mar. 3, 1932 s/UNITED STATES? RALPH PATENT HYDE, F GLEVELANDg'OHIO, assrenonlro 'rnn osTEB. ivrnnnraorunxne H COMPANY, OF CLEVELAND, 0310, A CORPORATION OF oHIo rsiazar Y 'nrn HEAD Application filedifuly 12, 1929. I Serial No. 377,776.

' The present application relates, as indi-' cated,'to a die head, and more particularly to that type of die head which is provided with one or more'chasers radially disposed and extending into the aperture of the head andreciprocableby means of a cam plate. The primary object of the invention is to providea die head ofthetype indicated having means for, automatically }Wli hdI31WlIlg the chasersfrom engagementwith the work at a giventimewith respect to the amount or work which has been done. Further objects will appear as the description'proceeds. To the" accomplishment of the foregoing and related-ends, said invention,- then, con-' sists of the means hereinafter fully described and particularly pointed out in the claims.

The annexed drawings and the following description set iorthTin detail certain mechanism embodying the invention, such disclosed means-constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

Insaid annexed draw1ngs: Fig. 1 is a front -elevat1onal view of a die head constructed in accordance with my invention; Fig. 2 is a central vertical section therethrough; and F ig. 3 is a section taken substantially upon the plane indicated by the section line 3-3 in Fig.2 and looking in the direction ofthe arrows.

Referring more particularly to the drawings, it will be seen that'the present device comprises a base 11 having mounted thereon or integral therewith-an annular head 12.

Y A cover plate 131s secured to the front end will be seen that each carrier 16 is'provided. with a-longitudinal bore adapted to receive of said head 12 and is formed with a plurality of projections 14 providing guide recesses15 slidably receiving carriers 16. The projections 14 are spaced about said cover plate and'are radially disposed as is clearly indicated in Figs. 1 and 2.

Referringmore particularly to Fig. 2, it

a bolt 17 to which is secured a chaser 18 throughthe'medium of a-screw connection 19.'

22 through which the bolt 17 passes and with a projection 23. As will be obvious, in assembling the device, the block 21 is placed'in the bore where after the bolt 17 is passed through the bore; of. the carrier 16 and through the bore 22 and'the chaser 18 is secured in place. The: carrier 16 is then mounted in the guide15 and the cover plate is fastened tothe head 12.

As the cover plate '13 is secured to the-head 12, the projection 23 oneach of the blocks 21 enters .a cam groove 24 in a cam plate 25 rotatably mounted in an annular socket 26- 28A 'carried'by the-camplate andhaving an 7 enlarged head the edges of which bear against the under sides of a slot 28Bin the back plate.

in the head 12. Aback late 27 is likewise a mounted in said socket 26,"and"is osci1lable j Secured to the back'plate 27 and extending therefrom beyond the head 12 is a lever 28 bifurcated at its end with ,a' slot-29. Said end is formed with a transverse bore 30 for the reception otja threaded pin 31, and ad justing nuts 32 and 33'are threaded on said pin,-the nut 32 being mounted in :the slot29 and the nut 38 being adapted to abut one face ofthe lever 28." I I A bracket 34 is secured to the head 12 and provides a pivot point 34' for an arm or handle 35 provided at its free end with a grip 3 6. A link 3? is pivoted at 38 to one end of the pin 31 and at its opposite end is pivoted at 39 to the arm 35.- It will be seen that this arrangement provides a toggle wherebythe lethat, when said pin engages the abutment 42, the pivot points 34, 39 and 38 are in dead center alignment.

At oneside, the back plate 27' is cut away, as is indicated at'43 in Fig. 1, to provide a shoulder 44 into which is threaded an eye bolt 45 to whichis connected one end 46 of a coil spring. The opposite end 47 'ot'said formed with an aperture 53. As isshown in Fig.*3,f-said"casing is formed at'oppositely spaced points with a pair of slots or grooves 54. An abutment member is likewise mounted in the cylinder 51 and is provided with a pair of fingers 56 slidably mounted in said grooves 54. An adjusting screw '57 passesthrough the aperture 53 and it is threaded into a central bore 58 in the member 55, said screwbeing formed with a knurled head 59 "easily accessible for adjustment of said screw; and intermediate its ends said screwis provided with a collar 6Q a'dapted to engage the base of the casing 52 to limit the; movement of said screw 57 under the influence of a coil spring 61 sleevedover said screw and normally held in compression between said casing 52 andsaid abutment 55 A stop screw 62 is adapted to bethreaded into said bore 58tolock the screw 57 in adiusted position. a 5. ,WVithin the housing 52 there is provided a bracket63 which provides a pivot point 64 for a bell crank lever '65. One arm 66 of said lever is bifurcated to straddle the screw 57, the furcations of said; arm being disposed normallyin engagement with the collarfiO.

Theother arm 67 ofsaid leversupportsa rod 68 which is mounted in a bore 69 in the head 12and projects through anaperture 70 in the housing 52. At its upper end, the rod 68 is provided with a threaded adjusting pin 71 adapted to be secured in adjusted position by means of alock nut 72. A bracket or pro'ection 73 on the arm 35 extends into the pat of said rod 68 and, in one positionof said arm, rests upon said pin 71 V I ln operation, a piece of Workis mounted in theaperture oi-cylinder 51 andis sup ported therein in any desired manner. The cam plate 25 having been secured to the back plate 27 in thedesired adjusted position, the arm 35 isfmoved into the position illustrated in Fig. 1, which rotates the cam plate 25in a clockwise direction as viewed in Fig. 1 to move the chasers, 18 into operative engagement with the Work. The workis now rotated and the chasers 18 cut a thread therein. As the thread. is cut, the work is advanced through the chasers toward the slidable abut-, ment e55. Eventually the work engages the V abutment and forces the same toward the right a as viewed in Fig. 2, compressing the spring 61, and rotating the lever 65 whereby the rod 68 ismoved upwardly. Through the engagement of the pin 71 with the projection 73, such upward movement of the rod 68 ini,-.

tiates rotation of the arm 35 in a counter clockwise direction as viewed in Fig. 1 about its pivot 34'. Such movement of the arm 35 elevates the pivot point 39, thus moving the same out of its dead center relation with respect to the points 34' and 38, Assoon as saidpivot point 39 has been moved a material distance out of the dead center line, the spring 46-47 contracts to cause a sudden rotation of the back plate 27 and its :connect'ed cam plate 25 in a counter clockwise direction as viewed in Fig. 1 to retract the chasers 18.

Itwill be obvious, of course, that it is possible for a workman to grasp the grip 36 and manually move the arm 35 to break the toggle and permit the spring 46- 47 to moye'the cam plate; and that this organizatiomeven without the automatic trip device, is advan; tageous. It willlikewise be obvioudthat, in casejof damage to saidspring, the cam plate may be operated entirely'by hand through the medium ot the arm 35, p e

Other modes of a plying the principleeof the invention may the one explained, change being made as res gards the mechanism herein disclosed, pro vided the means stated by any of thefollowing, claims or the equivalent of such stated means be employed, I e e a I therefore particularly point on tinctly claim asmy inventionr- 1 a g I a 1. A device of theclass described comprisingga head, arradially disposed chaser reciprocably carried by said head,.a cam plate mounted in said body and movable relative thereto, means connecting said chaser to said cam plate whereby movement of said plate causes reciprocation of said chaser, resilient means biasing said plate toward movement in one directiomtoggle means normally resisting the bias of said resilient means, and means for breaking saidtoggle, said'breaking means 7 comprising a movable abutment adapted to receive the thrust of advancing work, a rodmovable' by said abutment, a bell crank lever actuable by the thrust of said rod, and avsecond rod actuable by said bell crank leverg and bearing against one element of said toggle means. i

g 2. 'In a device of the class described, a head,

e employed insteadv 0;!

te in a chasermountedjfor radial reciprocation in said head, a camplatc rotatablymounted in advancing work bearing against-said handle,

and means for transmitting the thrust of saidsliding abutment to cause longitudinal movement of said rod. w

. tendency of said spring, a rod reciprocably" a spring biasing said cam plate towardmove- 3. In a device of the class described, an annular head, a chaser slidably mounted on said head to extend into the'aperture in said head, and automatic means for retracting said chaser comprising a cam plate connected to said chaser,fa spring biasing said cam plate toward movement in one direction, toggle mechanism normally resisting the mounted in said head perpendicular to the direction of travel ofwork and engaging one s member of said toggle mechanism, a lever having its one end in engagement with said rod, and a movable'abutment disposed'for movement in the direction of work being operatedupon by said device and engaging" said lever. s Y

4. In a device of the class described, an

annular head,the' inner surface of said head defining a cylindrical workreceiving aper ture, a housing secured in the rear of said aperture, an abutment slidably mounted in said aperture in advance of said housing, a

horizontal rod movable by said abutment and bearing reciprocably in said housing, a collar on said rod within said housing, a. Q chaser slidably mounted on said head to exe tend into the aperture in said head, and automatic means for retracting sa d chaser comprising a cam plate connected to sald chaser,

; ment in one direction, toggle mechanism nor mally resisting the tendency of said spring, a rod reciprocably mounted in said head projecting into said housing and having one end engaging one member of said toggle mechanism, abell crank lever having its one end i in engagement with the other end of said rod, said bell crank lever having its other end in engagement with said collar;

5. In a device of the class described, an annular head, a chaser slidably; mounted on said head to extend into the aperture in said head, and automatic means r'or retracting said chaser comprising a camplate connectedto said chaser, aspring biasing said cam plate toward movement in one direction, toggle mechanismnormally resisting the tendency of said spring, a rod reciprocably mounted in said head and engaging one member of said toggle mechanism, a lever having its one end in engagement with said rod, an adjustable resilientlymounted abutment disposed for movement in the direction of work being operated upon by saiddevice and engagingsaid lever; s

Signed yme this 5th day of Ji1ly,1929.

V RALPH E. HYDE, 

